linux-kernel - Re: [PATCH v10 13/21] ACPI / processor: Introduce phys_cpuid

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Message-ID: <5501678D.5090608@linaro.org>
Date:	Thu, 12 Mar 2015 18:16:45 +0800
From:	Hanjun Guo <hanjun.guo@...aro.org>
To:	Lorenzo Pieralisi <lorenzo.pieralisi@....com>
CC:	Catalin Marinas <Catalin.Marinas@....com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Will Deacon <Will.Deacon@....com>,
	Olof Johansson <olof@...om.net>,
	"grant.likely@...aro.org" <grant.likely@...aro.org>,
	Arnd Bergmann <arnd@...db.de>,
	Mark Rutland <Mark.Rutland@....com>,
	"graeme.gregory@...aro.org" <graeme.gregory@...aro.org>,
	Sudeep Holla <Sudeep.Holla@....com>,
	"jcm@...hat.com" <jcm@...hat.com>,
	Marc Zyngier <Marc.Zyngier@....com>,
	Mark Brown <broonie@...nel.org>,
	Robert Richter <rric@...nel.org>,
	Timur Tabi <timur@...eaurora.org>,
	Ashwin Chaugule <ashwinc@...eaurora.org>,
	"suravee.suthikulpanit@....com" <suravee.suthikulpanit@....com>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linaro-acpi@...ts.linaro.org" <linaro-acpi@...ts.linaro.org>
Subject: Re: [PATCH v10 13/21] ACPI / processor: Introduce phys_cpuid_t for
 CPU hardware ID

On 2015年03月12日 17:51, Lorenzo Pieralisi wrote:
> On Wed, Mar 11, 2015 at 12:39:39PM +0000, Hanjun Guo wrote:
>> CPU hardware ID (phys_id) is defined as u32 in structure acpi_processor,
>> but phys_id is used as int in acpi processor driver, so it will lead to
>> some inconsistence for the drivers.
>>
>> Furthermore, to cater for ACPI arch ports that implement 64 bits CPU
>> ids a generic CPU physical id type is required.
>>
>> So introduce typedef u32 phys_cpuid_t for x86 and ia64, and introduce
>> a macro CPU_PHYS_ID_INVALID as (u32)(-1), use phys_cpuid_t when phys_id
>> defined in acpi processor driver, and replace CPU_PHYS_ID_INVALID as -1
>> for phys_id, this will solve the inconsistence in acpi processor driver,
>> and will prepare for the ACPI on ARM64 for the 64 bit CPU hardware ID
>> in the following patch.
>
> Nit: Commit log above is stale (since you moved the phys_cpuid_t to
> common declaration for all archs that do not define PHYS_CPUID_INVALID
> and the macro name itself changed) so you should rewrite it before

Oops, I will send a updated patch only for this one, good catch.

> asking to merge it. Furthermore you should not describe how you implemented
> the change, you should describe why.

I'm prefer writing the commit log as following way (not always) :)
  - why the patch is needed
  - what the patch implements
  - How the patch is implemented

>
> Other than that:
>
> Acked-by: Lorenzo Pieralisi <lorenzo.pieralisi@....com>

Thanks!

Hanjun
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